EL6839
®
Data Sheet
PRELIMINARY
July 15, 2004
FN7227.2
Dual 4-Channel Driver with Oscillator and
LVDS
Features
The EL6839 is a high performance,
dual output, laser driver for writeable
DVD drives. The ENA pin enables the
chip, while the SEL1 pin selects the IOUT pin. Various
waveforms can be generated where the amplitude is
determined by the currents flowing into IINR, IIN2, IIN3, and
IIN4. The timing is determined by the signals at WEN2WEN2B, WEN3-WEN3B, and WEN4-WEN4B. The oscillator
is enabled when OSEN is high. The amplified IINR current of
the selected channel is enabled when the ENA pin is high.
The total output current is the sum of the read current, the
enabled write currents, and the oscillator current when
enabled.
• Voltage-controlled output current source requiring one
external set resistor per channel
Usually a voltage DAC will drive a resistor that is in series
with the IINR, IIN2, IIN3, and IIN4 input. The resistor allows
the user to optimize the current gain for each channel.
• Oscillator frequency to 600MHz
WEN2-WEN2B, WEN3-WEN3B and WEN4-WEN4B are
LVDS input pins with 100Ω external termination. Output write
current pulses are enabled when a high is applied to the
WEN2-WEN2B, WEN3-WEN3B, or WEN4-WEN4B pin. The
write current will flow to the selected output. When SEL1 is
high IOUT1 is selected. WENRB enables read and oscillator
current when low.
• Two channels for CD or DVD
• LVDS interface
• Rise time = 0.8ns
• Fall time = 0.8ns
• Channel 2 to 250mA max
• Channel 3 to 150mA max
• Channel 4 to 100mA max
• External 100Ω LVDS termination
• On chip oscillator with frequency and amplitude control by
use of external resistors to ground
• Oscillator amplitude to 100mAP-P
• Single +5V supply (±10%)
• Chip ENAs for power savings
• Pb-free available
Applications
• Super combo drives
• DVD drives
The RF oscillators frequency is determined by RFREQ1 or
RFREQ2, and its amplitude by RAMP1 or RAMP2.
Ordering Information
PART
NUMBER
TEMP. RANGE
PACKAGE
PKG. DWG. #
EL6839CL
32-Pin QFN
-
MDP0046
EL6839CL-T7
32-Pin QFN
7”
MDP0046
EL6839CL-T13
32-Pin QFN
13”
MDP0046
EL6839CLZ
(See Note)
32-Pin QFN
(Pb-free)
-
MDP0046
EL6839CLZ-T7
(See Note)
32-Pin QFN
(Pb-free)
7”
MDP0046
EL6839CLZT13 (See Note)
32-Pin QFN
(Pb-free)
13”
MDP0046
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NOTE: Intersil Pb-free products employ special Pb-free material
sets; molding compounds/die attach materials and 100% matte tin
plate termination finish, which is compatible with both SnPb and
Pb-free soldering operations. Intersil Pb-free products are MSL
classified at Pb-free peak reflow temperatures that meet or exceed
the Pb-free requirements of IPC/JEDEC J Std-020B.
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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